<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type='number'></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type='number'></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type='number'></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                             v-model="addForm.goods_cat"
                             :options="catelist"
                             :props="cateProps"
                             @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的Item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <!-- action 表示图片要上传到的后台API地址 -->
                    <el-tab-pane label="商品图片" name="3">
                        <el-upload
                         :action="uploadURL"
                         :on-preview="handlePreview"
                         :on-remove="handleRemove"
                         list-type="picture"
                         :headers="headerObj"
                         :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品的按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>    
        </el-card>

        <!-- 图片预览 -->
        <el-dialog
         title="图片预览"
         :visible.sync="previewVisible"
         width="50%">
            <img :src="previewPath" alt="" class="img-i">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'


export default {
    data() {
        return {
            //这是商品分类列表
            catelist: [],
            
            activeIndex: "0",

            //添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                //商品所属的分类数组
                goods_cat: [],
                //图片的数组
                pics: [],
                //商品的详情描述
                goods_introduce: '',
                attrs: []
            },
            addFormRules: {
                goods_name: [{required: true, message :'请输入商品名称', trigger: 'blur'}],
                goods_price: [{required: true, message :'请输入商品价格', trigger: 'blur'}],
                goods_weight: [{required: true, message :'请输入商品重量', trigger: 'blur'}],
                goods_number: [{required: true, message :'请输入商品数量', trigger: 'blur'}],
                goods_cat:[{required: true, message :'请选择商品分类', trigger: 'blur'}],
            },

            cateProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children',
                expandTrigger: 'hover'
            },
            //这是动态参数列表数据
            manyTableData: [],
            //这是静态属性列表数据
            onlyTableData: [],
            //上传图片的URL地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            //图片上传组件的header请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            //图片预览的存放地址
            previewPath: '',
            previewVisible: false

        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        //获取所有商品分类数据
        async getCateList() {
            const {data: res} =await this.$http.get('categories')

            if(res.meta.status !== 200) {
                return this.$message.error('添加商品分类失败！')
            }

            this.catelist = res.data
            // console.log(this.catelist);
        },
        //级联选择器选中项变化，会触发这个函数
        handleChange() {
            console.log(this.addForm.goods_cat);
            if(this.addForm.goods_cat.length !==3) {
                this.addForm.goods_cat = []
            }
        },
        //判断是否满足离开标签的条件
        beforeTabLeave(activeName,oldActiveName) {
            //oldActiveName是即将离开的标签名字
            //对oldActiveName进行判断
            if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3)
            {
                this.$message.error('请选择商品分类！')
                return false
            }
        },
        //判断访问的是哪个标签
        async tabClicked() {
            //证明访问的是动态参数面板
            if (this.activeIndex === '1') {
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params: {sel:'many'}
                })
                if(res.meta.status !== 200) {
                return this.$message.error('获取动态数据参数失败！')
                }
                console.log(res.data);
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
                })
                this.manyTableData = res.data
            }else if(this.activeIndex === '2') {
                //证明访问静态属性面板
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params: {sel:'only'}
                })
                if(res.meta.status !== 200 ) {
                    return  this.$message.error('获取静态数据属性失败！')
                }
                console.log(res.data);
                // res.data.forEach(item => {
                //     item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
                // })
                this.onlyTableData = res.data
            }

            
        },
        //处理图片预览效果
        handlePreview(file) {
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        //处理移除图片的操作
        handleRemove(file) {
            // console.log(file);
            //1 获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            //2 从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex( x => x.pic === filePath)
            //3 调用数组的 splice 方法，把图片信息对象从pics数组中移除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm);
        },
        //监听图片上传成功的事件
        handleSuccess(response) {
            console.log(response);
            //1.拼接得到一个图片信息对象
            const picInfo = {pic:response.data.tmp_path}
            //2.将图片信息对象，push 到 pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm);
        },
        //点击按钮，添加商品
        add() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                    return this.$message.error('请填写必要的表单项')
                }
                //执行添加的业务逻辑
                //lodash  cloneDeep(obj)
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                //处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(',')
                    }
                    this.addForm.attrs.push(newInfo)
                })
                //处理静态属性
                 this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form);

                //发起请求添加商品
                //商品的名称，必须唯一
                const {data: res} = await this.$http.post('goods',form)

                if(res.meta.status !== 201) {
                    return this.$message.error('添加商品失败！')
                }
                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
            })
        }
    },
    computed: {
        //三级分类的ID
        cateId() {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox {
    margin: 0 10px 0 0 !important;
}

.img-i {
    width: 100%;
}

.btnAdd {
    margin-top: 15px;
}
</style>